The loop PQ, as shwon in figure moves with a velocity . Both loop and velocity are in the plane of paper and a magnetic field exists in the region perpendicular to plane and directed inward. Find the emf induced between P and Q.

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B v 2 r

B(a+ b+2r ) v

B a +b + πr v

π r B v

answer is B.

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Detailed Solution

effective length of conductor perpendicular to v is a+ b+2r

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